Contexto

Teste

Análise

Leitura do conjunto de dados

```r
df <- readxl::read_excel('./mobile_app_user_dataset_1.xlsx')[-1,]

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### Exploração

> Uma vez que é uma pesquisa sobre *mobile devices*, veremos qual a proporção de pessoas que de fato possuem um *device*.


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```r
```r

df %>% 
  select(Q2) %>% 
  drop_na() %>% 
  mutate(
    Q2 = case_when(
      Q2 == 1 ~ \Possui\,
      Q2 != 1 ~ \Não Possui\
    )
  ) %>% 
  ggplot(
    aes(
      y = Q2,
      fill = Q2
    )
  ) +
  geom_bar(
    position = \dodge\,
  ) +
  geom_label(
      stat = 'count',
      aes(
        label = ..count..,
      ),
      color = 'white',
      show.legend = FALSE
  ) + 
  labs(
    y = \\,
    x = \Total de Pessoas\,
    title = \Distribuição de pessoas que tem ou não celular\,
    subtitle = \Dados oriundos da pesquisa realizada pela Harvard\
  ) +
  scale_fill_manual(
    values = c( \#C4161C\, \#009491\),
  ) +
  theme_classic() +
  theme(
    axis.title.x = element_text(vjust=-.2, size=11),
    legend.title = element_blank()
  ) 



Podemos visualizar que a grande parte das pessoas possuem celular.


A proporção de pessoas que não tem é de 12%.


Visualizaremos agora os diferentes tipos de dispositivos utilizados pelos usuários que possuem celular


phone_format <- function (phone_list, phone_type, apply_function = function(param) param) {
  phone_dic = list(
    apple = c(\apple\, \iphone\, \ipad\, \aple\, \appale\, \ipod\, \aplle\, \i-phone\, \ipone\, \applke\, \applr\, \appme\, \iphon\),
    blackberry = c(\blackberry\, \blackb\, \blackeb\, \baclkberry\, \blakckberry\, \blacberry\, \blakberry\, \blackerry\, \bleckberry\),
    samsung = c(\samsung\, \samsumg\, \sansung\, \sumsung\, \samsug\, \samsun\,  \samgung\, \samsing\, \samung\, \sansug\, \samasung\, \samsang\, \samsong\, \sumsang\, \galaxynote\),
    null = c(\\\?\, \9000\, \930p\),
    sony_ericsson = c(\sony-\, \sonyer\, \sony\, \erison\),
    nokia = c(\nokia\, \nokya\),
    asus = c(\asus\),
    acer = c(\acer\)
  ) 
  
  
  str_detect(phone_list, paste(phone_dic[[phone_type]], collapse = \|\)) ~ apply_function(phone_type)
}

phones <- df %>%
  filter(Q2 == 1) %>% 
  select(Q3_1_TEXT) %>% 
  drop_na() %>% 
  mutate(
    Q3 = str_replace(str_to_lower(Q3_1_TEXT), \ \, \\)
  ) %>% 
  mutate(
    Q3 = case_when(
      phone_format(Q3, \apple\),
      phone_format(Q3, \samsung\),
      phone_format(Q3, \blackberry\),
      phone_format(Q3, \null\),
      phone_format(Q3, \sony_ericsson\, function(param) str_replace(param, \_\, \ \)),
      TRUE ~ Q3
    )
  ) %>% 
  group_by(Q3) %>% 
  count() %>%
  arrange(desc(n)) 

phones
length(names(df))
[1] 161
df

q5_answers <- data.frame(
  row.names = c(1, 2, 3, 4, 5, 6, 7, 8, 9),
  val = c(\Never\, \Less than once a month \, \Once a month\, \More than once a month\, \Once a week\, \More than once a week\, \Once a day\, \Several times a day\, \Other\)
)

df %>% 
  select(Q5) %>% 
  drop_na() %>% 
  mutate(
    Q5_TEXT = qr_answers[Q5, ]
  ) %>% 
  group_by(Q5_TEXT) %>% 
  count() %>% 
  arrange(desc(n)) %>% 
  ggplot(
    aes(
      x = reorder(Q5_TEXT, -n),
      y = n,
      fill = Q5_TEXT
    )
  ) +
  geom_col() +
  labs(
    x = 'Frequencia de abertura da loja de aplicativos',
    y = 'Total'
  ) +
  theme(
    axis.text.x = element_text(angle = 45, vjust=.6),
  )

NA

q6_answers <- data.frame(
  row.names = c(1, 2, 3, 4, 5, 6),
  val = c("0 - 1", "2 - 5", "6 - 10", "11 - 20", "21 - 30", "Mais de 30")
)


df %>% 
  select(Q6) %>% 
  drop_na() %>% 
  mutate(
    Q6_TEXT = q6_answers[Q6,]
  ) %>% 
  group_by(Q6_TEXT) %>% 
  count() %>% 
  ggplot(
    aes(
      x = reorder(Q6_TEXT, -n),
      y = n,
      fill = Q6_TEXT
    )
  ) +
  geom_col() +
  labs(
    x = 'Quantidade de aplicativos baixados por mês',
    y = 'Total',
  ) +
  theme_classic() +
  labs(
    fill = 'Frequência'
  ) +
  theme(
    axis.text.x = element_text(vjust = -1),
    axis.title.x = element_text(vjust = -1),
  )

Vamos ver se a galera que mais baixa é a galera que mais acessa a loja


df %>% 
  select(Q5, Q6) %>% 
  drop_na() %>% 
  mutate(
    Q5 = q5_answers[Q5,],
    Q6 = q6_answers[Q6, ]
  ) %>% 
  group_by(Q5, Q6) %>% 
    count() %>% 
  arrange(desc(n)) %>% 
  ggplot(
    aes(
      y = reorder(Q5, -n),
      x = n,
      fill = Q6
    )
  ) +
  geom_bar(
    stat = "identity",
    position = position_dodge(width = 1)
  ) +
  geom_label(
    aes(
      label = n,
    ),
    size = 3
  ) +
  labs(
    y = 'Frequência de acesso à loja de aplicativos',
    x = 'Total'
  ) +
  theme(
    axis.text.x = element_text(angle = 20, vjust = 0.5),
  ) +
  facet_grid(rows = 'Q6')

Definindo função genéricas para contagem e plotagem de dummy vars

arrange_and_plot <- function(df, 
                             cols, 
                             named_cols,
                             desc_col = \reason\, 
                             legend.position = \none\,
                             title = \\,
                             xlabel = \\,
                             ylabel = \\,
                             show.legend = FALSE,
                             col.width = 0.5,
                             dodge.width = 0.5,
                             xaxis.title.size = 13,
                             xaxis.title.vjust = 0.5,
                             yaxis.title.size = 13,
                             yaxis.title.vjust = 0,
                             xaxis.text.angle = 0,
                             xaxis.text.vjust = 0,
                             invert.axis = FALSE,
                             hide.yaxis.title = FALSE,
                             hide.xaxis.title = FALSE
                             ) {
  rdf <- df %>% 
    select(cols) %>% 
    rowwise() %>% 
    sapply(as.numeric) %>% 
    as.tibble() %>% 
    rowwise() %>% 
    replace(is.na(.), 0) %>% 
    rowwise() %>% 
    sapply(sum, simplify = FALSE)  %>% 
    as.tibble()

  names(rdf) <- named_cols 
  
  plot <- rdf %>%
    gather(
      desc_col, \total\, 1:ncol(.)
    ) %>% 
    ggplot(
      aes(
        x = if (invert.axis) total else reorder(desc_col, -total),
        y = if (invert.axis) reorder(desc_col, total) else total,
        fill = desc_col
      )
    ) +
    geom_col(
      width = col.width,
      position = position_dodge(dodge.width)
    )
  
  if (invert.axis) {
    plot <- plot +
      geom_label(
        aes(
          x = total,
          label = total,
        ),
        show.legend = show.legend
      )  
  } else {
    plot <- plot +
      geom_label(
        aes(
          y = total,
          label = total,
        ),
        show.legend = show.legend
      )
  }
  
  plot +
    labs(
        title = title,
        x = xlabel,
        y = ylabel
    ) +
    theme_classic() +
    theme(
      legend.position = legend.position,
      axis.title.x = if (!hide.xaxis.title) element_text(size=xaxis.title.size, vjust=xaxis.title.vjust)  else element_blank(),
      axis.title.y = if (!hide.yaxis.title) element_text(size=yaxis.title.size, vjust=yaxis.title.vjust) else element_blank(),
      axis.text.x = element_text(angle = xaxis.text.angle, vjust=xaxis.text.vjust)
    )
}

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join_columns_and_plot <- function(dfp, cols) {
   dfp %>% 
    select(cols) %>% 
    rowwise() %>% 
    sapply(as.numeric) %>% 
    as.tibble() %>% 
    rowwise() %>% 
    replace(is.na(.), 0) %>% 
    rowwise() %>% 
    sapply(sum, simplify = FALSE)  %>% 
    as.tibble()
}

Principais motivos para baixar apps


q7_names <-c("Feeling Depressed", "Need to carry out a task", "Feeling bored", "Want to be entertained", "Need to know something", "Other")

q7_cols <- names(df)[(21:26)]

df %>% 
  arrange_and_plot(
    q7_cols,
    q7_names,
    title = 'Fatores motivadores que levam as pessoas a baixarem apps',
    xlabel = 'Motivo',
    ylabel = 'Total',
    dodge.width = 0.5,
    col.width = 0.6,
    xaxis.title.vjust = -0.5
    )
Warning: `as.tibble()` was deprecated in tibble 2.0.0.
Please use `as_tibble()` instead.
The signature and semantics have changed, see `?as_tibble`.
This warning is displayed once every 8 hours.
Call `lifecycle::last_lifecycle_warnings()` to see where this warning was generated.
Note: Using an external vector in selections is ambiguous.
ℹ Use `all_of(cols)` instead of `cols` to silence this message.
ℹ See <https://tidyselect.r-lib.org/reference/faq-external-vector.html>.
This message is displayed once per session.

Principais formas de encontrar aplicativos

q8_cols = names(df)[(27:35)]

q8_names <- c(
  "Compare several to choose one",
  "Download the first presented",
  "Featured apps",
  "Among top downloads",
  "Randomly choose one that might interest",
  "Search using keywords",
  "Visit websites that review apps",
  "Use search engines",
  "Other"
)

df %>% 
   arrange_and_plot(
    q8_cols,
    q8_names,
    title = 'Fatores motivadores que levam as pessoas a baixarem apps',
    xlabel = 'Total',
    ylabel = 'Motivo',
    dodge.width = 0.5,
    col.width = 0.6,
    invert.axis = TRUE
    )

NA

O que mais consideram para baixar


q9_cols <- names(df)[(36:48)]

q9_names <- c(
  "Reviews by other users",
  "Name of app (e.g., catchy name)",
  "Number of users who have downloaded the app",
  "Icon (e.g., if the icon is attractive)",
  "Description of the app",
  "Features",
  "Number of users who have rated the app",
  "Price",
  "Star rating",
  "Size of app",
  "Screen shots (e.g., see how it looks running)",
  "Who developed the app",
  "Other"
)


df %>% 
  arrange_and_plot(
    q9_cols,
    q9_names,
    "Motivo",
    title = "Motivos para escolher o aplicativo para baixar",
    xlabel = "Total",
    ylabel = "Porque baixa",
    col.width = 0.7,
    invert.axis = TRUE,
    hide.yaxis.title = TRUE,
    hide.xaxis.title = TRUE
  )

Porque de fato baixam um aplicativo


q10_cols <- names(df)[(49:(49+14))]

q10_names <- c(
  "To interact with friends and/or family.",
  "To interact with people I don't know.",
  "To help me carry out a task.",
  "It is featured in the app store.",   
  "It is on the top downloads chart.",
  "It is advertised in the apps that I am using. ",
  "For entertainment.",
  "Out of curiosity. ",
  "An impulsive purchase.", 
  "It features brands or celebrities that\nI like\n(e.g., Coca-Cola, Michael Jackson). ",
  "It was mentioned in the media\n(e.g., TV, newspaper, radio, blogs). ",
  "It is an extension of the \nwebsite that I use (e.g., Facebook app). ",
  "It is recommended by friends and/or family. ",
  "For someone else (e.g., children, partner).",
  "Other"
)

df %>% 
  arrange_and_plot(
    q10_cols,
    q10_names,
    "Motivo",
    title = "Motivos que levam ao download do app",
    xlabel = "Total",
    ylabel = "",
    col.width = 0.6,
    dodge.width = 1,
    invert.axis = TRUE,
    hide.yaxis.title = TRUE,
    hide.xaxis.title = TRUE
  )

q9_cols <- names(df)[(64:(63+12))]

df %>% 
  arrange_and_plot(
    q9_cols,
    q9_cols,
    invert.axis = TRUE
  )


countries = c(
  "American",
  "Australian",
  "Brazilian",
  "British",
  "Canadian",
  "Chinese",
  "French",
  "German",
  "Indian",
  "Italian",
  "Japanese",
  "Mexican",
  "Russian",
  "South Korean",
  "Spanish",
  "Other",
  "Not assigned - NA"
)

country_df <- df %>% 
  group_by(Q19) %>% 
  count() %>% 
  dplyr::mutate(
    Q19 = as.numeric(Q19)
  ) %>%
  dplyr::arrange(Q19) %>% 
  mutate(
    Q19 = as.character(Q19)
  )


country_df$Q19 <- countries


country_df %>% 
  ggplot(
    aes(
      y = reorder(Q19, n),
      x = n,
      fill = Q19
    )
  ) +
  geom_bar(
    stat = "identity",
    position = position_dodge(10)
  ) +
  labs(
    x = 'Total de pessoas',
    y = 'País',
    fill = ''
  ) +
  theme(
    legend.position = "none",
    axis.text.x = element_text(vjust=0.5, angle = 15)
  )

df %>% 
  select(names(df)[c(76:79)]) %>% 
  drop_na
logit_user_feats <- c("Q5", "Q6", "Q16", "Q17", "Q18", "Q19", "Q23", "Q24", "Q26", "Q27")

df_logit <- df %>% 
  pivot_longer(starts_with("Q11_"), names_to="Potential", values_to="Potential_value") %>% 
  mutate(
    Potential = as.factor(as.numeric(str_extract(Potential, "([0-9]+)$"))),
    Q17 = as.integer(Q17)
  ) %>% 
  drop_na("Potential_value") %>% 
  select(
    logit_user_feats, starts_with("Q7_"), starts_with("Q8_"), 
    starts_with("Q9_"), starts_with("Q10_"), starts_with("Q11_"), 
    starts_with("Q13_"), starts_with("Q14_"), starts_with("Q15_"),
    Potential
  ) %>% 
  mutate_all(
    funs(as.numeric(.))
  ) %>% 
  mutate_all(
    funs(replace_na(., 0))
  ) %>% 
  mutate(
    Potential = as.factor(Potential)
  )

df_logit <- df %>% 
  pivot_longer(starts_with("Q11_"), names_to="Potential", values_to="Potential_value") %>% 
  mutate(
    Potential = as.factor(as.numeric(str_extract(Potential, "([0-9]+)$"))),
    Q17 = as.integer(Q17)
  ) %>% 
  drop_na("Potential_value") %>% 
  select(
    logit_user_feats, starts_with("Q7_"), starts_with("Q8_"), 
    starts_with("Q9_"), starts_with("Q10_"), starts_with("Q11_"), 
    starts_with("Q13_"), starts_with("Q14_"), starts_with("Q15_"),
    Potential
  ) %>% 
  mutate_all(
    funs(as.numeric(.))
  ) %>% 
  mutate_all(
    funs(replace_na(., 0))
  ) %>% 
  mutate(
    Potential = as.factor(Potential)
  )
df %>% 
  drop_na(Q17) %>% 
  group_by(Q17) %>% 
  count() %>% 
  arrange(desc(n))
df_logit %>% 
  select(Potential) %>% 
  group_by(Potential) %>% 
  count() %>% 
  arrange(n)
NA

Logit

Treinando o modelo

logit_fit
Call:
nnet::multinom(formula = Potential ~ ., data = train, family = "binomial", 
    MaxNWts = 10000)

Coefficients:
   (Intercept)          Q5           Q6        Q16          Q17        Q18          Q19
2    -2.831077  0.19314421  0.004161363 -0.3357207 -0.009387795 0.26225274 -0.007136793
3    -2.516666  0.14964958  0.062203240 -0.4114570  0.004371494 0.06412545 -0.043747198
4    -1.643322  0.02473883  0.038363577 -0.3069615  0.002536063 0.13703026 -0.017205541
5    -2.277490  0.13373126  0.050118183 -0.2801466 -0.005069066 0.15275730  0.003345424
6    -1.603665  0.05867205 -0.027128103 -0.2174974 -0.011237502 0.05232554 -0.024047783
7    -1.995366  0.12635273  0.064530462 -0.1977068 -0.008755982 0.21198390 -0.020068860
8    -2.841578  0.09212726  0.084028442 -0.5093149 -0.007700749 0.22589499 -0.038007138
9    -2.676805  0.14611839  0.083300078 -0.2886305 -0.008733964 0.18167614 -0.028369655
10   -2.139975 -0.05098983 -0.426191281 -0.1625053  0.010872033 0.02276676 -0.035750468
11   -2.506288  0.21970822  0.020871833 -0.4863416 -0.014578997 0.26021978 -0.008588354
           Q23          Q24          Q26          Q27       Q7_1         Q7_2        Q7_3
2  -0.11475293 -0.011932040 -0.017762590  0.001224567 -0.3273897 -0.006565511 -0.12778748
3  -0.07388938  0.029846580 -0.070107874 -0.018509979 -0.1886862 -0.069507829  0.03635108
4   0.07250743 -0.023823120 -0.056606214 -0.014272725 -0.2970201  0.033226531 -0.24981206
5   0.05211095 -0.018508863 -0.004296008 -0.015381987 -0.2153086  0.005961373 -0.25281799
6   0.10221845 -0.015402683 -0.018769485 -0.021353499 -0.2226241  0.099047243 -0.02343900
7  -0.00587136 -0.003947630 -0.082206616 -0.021578089 -0.5231015  0.078552878 -0.17132130
8   0.21164926 -0.016366188 -0.068373565 -0.016606348  0.1757757 -0.142145512 -0.26783935
9   0.12220663 -0.027326144 -0.061018920 -0.015603917 -0.4257900  0.278902985 -0.20898424
10  0.01902384 -0.009246391 -0.012659432 -0.024073792 -1.4169030 -0.576445905 -0.62210996
11  0.11007697 -0.015533882 -0.075624455  0.004333665 -0.1266129 -0.062915609 -0.12461105
          Q7_4        Q7_5        Q7_6      Q8_1         Q8_2        Q8_3        Q8_4
2   0.07402743 -0.04926993  0.42389213 0.4546129  0.054833705  0.25633159  0.18109714
3  -0.02432760 -0.09508477  0.41086061 0.2739049 -0.018247110  0.19367040  0.18530447
4   0.10814208  0.04369644  0.38750228 0.1739729  0.235013824  0.39712599 -0.03026940
5   0.16844707  0.15029793 -0.22545247 0.3261790  0.084001712  0.18183069  0.08173635
6  -0.05931305  0.08812191  0.17429044 0.2996749 -0.190020827  0.12068714  0.17854717
7   0.20030625 -0.04474142  0.18000242 0.2624625 -0.077350666  0.21700502  0.14269081
8  -0.53531851 -0.07689812 -0.91673528 0.4044391  0.237044845  0.09141466  0.23006722
9   0.01582758  0.14088673  0.04411266 0.3744076 -0.178807358  0.41666936  0.14154636
10 -0.31341224 -0.13515732  0.37093932 0.4664463  0.691994620 -0.19002242 -0.06748627
11  0.30474982  0.18214132 -0.80370520 0.2061919 -0.136897988  0.16972730  0.14954853
            Q8_5        Q8_7      Q8_8        Q8_9       Q8_10        Q9_1        Q9_2
2  -0.0927440011  0.22843554 0.6188075  0.28729806 -0.09479455 -0.17562083 -0.06637064
3   0.1180314934  0.20553981 0.3035256  0.26245845  0.20784151  0.04127033 -0.13585906
4  -0.1508795522  0.04273248 0.4728787  0.12342009 -0.55997498 -0.27201047  0.01691151
5  -0.0733877951  0.16236867 0.2946529  0.19563806  0.03857156  0.07773995 -0.14257689
6  -0.1803180913  0.10406247 0.2311458  0.05093760 -0.30938381  0.11858252 -0.17357420
7  -0.0005617848  0.06975359 0.4759930  0.22199743 -0.01609591 -0.05934720 -0.27227179
8   0.1126394863  0.16660657 0.8086141  0.46023488 -0.21607017 -0.19009589 -0.26620072
9  -0.2582946078  0.04400909 0.5689429 -0.01205932 -0.38115538 -0.08692433 -0.18962640
10  0.2978943298  0.22562167 0.1769604  0.42010753  0.92040894 -0.18067628  0.28628392
11 -0.1039243429 -0.03672964 0.5048358 -0.03904161 -0.78991114 -0.02439985 -0.20106557
           Q9_3        Q9_4        Q9_5        Q9_6         Q9_7       Q9_8        Q9_9
2   0.010794258  0.15501643 -0.01258929  0.01750330 -0.083674849 0.66093929  0.01879016
3  -0.005616802 -0.01413053  0.08863840  0.01071956 -0.081620317 0.92029361 -0.09614364
4   0.250670230 -0.10329657  0.02686441 -0.07008140 -0.050111043 0.16261538 -0.08588886
5   0.158764070  0.26121889  0.15058093  0.04660817 -0.058973640 0.30142604  0.00578427
6   0.072381441 -0.03027443  0.28362386  0.18080872 -0.125079342 0.59189995 -0.12307577
7   0.038574579  0.18874711  0.14475552  0.38167847 -0.018639986 0.26782217  0.09370258
8  -0.189706186  0.29495112 -0.02754503  0.13553867  0.109301344 0.35364094 -0.09946875
9   0.195708876  0.11186023  0.08867708  0.08432934 -0.007565676 0.25988088 -0.05095026
10 -0.341531332 -0.35313099  0.20057838 -0.08483723  0.068390101 0.08239902 -0.68873167
11  0.161127118  0.16666630  0.12963231  0.05253685  0.016356211 0.45419501 -0.18510437
         Q9_10         Q9_11      Q9_12      Q9_13       Q10_1       Q10_2       Q10_3
2   0.06941249  0.2838817087  0.4076446 -1.6125788  0.18849654  0.38378006  0.09888458
3  -0.01264827  0.1636982459  0.3256305 -2.9167772  0.10182969  0.02727020  0.20251712
4   0.15283003 -0.0510164725  0.2642467 -0.7174872  0.12072349  0.45336666  0.22499325
5   0.07090717  0.1030745363  0.1253765  0.2689275  0.16636850  0.19256866  0.33599264
6  -0.01924235  0.0880114819  0.2902647 -1.3245600  0.14196463  0.13784582  0.41006395
7  -0.01305607  0.1015923307  0.2415514 -1.0859023 -0.02410912  0.07253304  0.21761326
8  -0.08755311  0.0004197098  0.5042589 -2.4168312  0.33684650  0.26144058 -0.01639989
9   0.08039864  0.1327298874  0.2256257  0.2663563  0.04713361  0.33730367  0.22052983
10 -0.67898960  0.3334148956 -1.0354792  0.6090934  0.22271883 -0.74929341  0.17924710
11  0.06684000 -0.0216071559  0.5183782 -2.0375151  0.14507755  0.43563286  0.24543953
         Q10_4       Q10_5        Q10_6       Q10_7      Q10_8     Q10_9      Q10_10     Q10_11
2  -0.01824869  0.10215193  0.162355558 -0.33870546 -0.2435150 0.9041642  0.03481875 0.17984589
3   0.24460641 -0.03625905  0.080329952  0.16365242 -0.1236544 0.9157578  0.04951013 0.24666361
4   0.15931557 -0.10728450  0.308677295  0.05042364 -0.3388083 0.6370137  0.37231696 0.29242588
5   0.10859082  0.06250834  0.193782955 -0.14071722 -0.2186133 0.8479041  0.04337904 0.09852663
6   0.26849668 -0.05349044  0.170773541 -0.01561051 -0.1483034 0.8704540 -0.04689152 0.12906971
7   0.20008255 -0.06543156  0.263411862 -0.16118019 -0.1445994 1.0195425  0.34318033 0.18168666
8   0.24475656  0.11643685 -0.003948784 -0.14975360 -0.1224306 0.8263344  0.44298220 0.20467052
9   0.39733921  0.10852853  0.272558620  0.05258584 -0.2994447 1.0068521  0.13137397 0.04130151
10  0.31338940 -0.76191371 -0.819047089  0.02146000  0.4696538 1.1814127 -0.39299128 0.57138472
11  0.14090285  0.05401613  0.157245222 -0.01455343 -0.2273161 0.8907470  0.19554274 0.20504680
        Q10_12      Q10_13      Q10_14      Q10_15      Q13_1       Q13_2        Q13_3
2   0.22650233  0.01253063  0.10675680 -0.69091773 -0.8067342 -0.63669450  0.057701261
3   0.02549043  0.15536189  0.04250272  0.51432525 -0.8924092 -0.26751989  0.062381803
4   0.12342114 -0.03259669  0.10735930 -0.82617839 -1.1075524 -0.23291396  0.277940534
5   0.17346289  0.14596063  0.12767655 -0.74173957 -0.7299857  0.02392404  0.120803486
6   0.17728992 -0.05290743  0.25601113 -1.56052923 -0.3578338 -0.12878161  0.285393923
7   0.13232849  0.09257728 -0.10785407 -2.08681825 -0.6314696 -0.02376094  0.101484270
8   0.33601827  0.47444825 -0.13937788 -2.73883541 -0.9520312  0.04001074  0.242747669
9   0.11934481  0.19800758  0.06571727 -0.05160603 -0.7877894 -0.09882180  0.006756926
10 -0.37719835 -0.12026632 -1.26232357  3.09416727 -0.9221408 -0.75894517 -1.246875591
11 -0.03779334  0.16771581 -0.12082981  0.12441657 -0.7970070  0.03673945  0.206048689
         Q13_4       Q13_5       Q13_6        Q13_7       Q14_1      Q14_2       Q14_3
2   0.02447495  0.41085965  0.01236241  0.216524234 -0.42339013 0.16687301  0.64047720
3  -0.09410995 -0.01490311  0.10327466 -0.405644290 -0.21720073 0.01196077  0.26645161
4  -0.21049144  0.05630345  0.19512296 -0.251444538 -0.18012077 0.20326034  0.43899264
5   0.05424756  0.13820074  0.22268393  0.123192510 -0.12463029 0.12346176  0.13101793
6  -0.01863604  0.02155430  0.08190169  0.563211705 -0.04024215 0.17348826  0.22944540
7  -0.19918635 -0.08157111  0.04227276 -0.365884642 -0.26828743 0.22196887  0.32539145
8  -0.28864745  0.22403966 -0.17446306  0.178967532 -0.45251514 0.33066588  0.23462200
9  -0.10832183  0.07317816  0.09625005  1.911494063 -0.19144835 0.20568804  0.21634041
10 -0.12054782  0.12827956 -0.72118470  0.898523803 -0.56958297 0.89333305 -0.21785836
11 -0.12203964  0.09006985 -0.11722242  0.005613312 -0.16816271 0.09377080  0.02509614
         Q14_4       Q14_5       Q14_6       Q14_7       Q14_8        Q14_9       Q14_10
2   0.07140485 -0.26567013 -0.25129490  0.30203243 -0.42751502  0.045219330 -0.011489388
3  -0.01518089  0.14005862  0.08127085  0.34339798 -0.47022875 -0.035324252 -0.002281833
4   0.02193581  0.09384575  0.13019480  0.02192473 -0.46624910  0.210361040  0.027846321
5  -0.04802637 -0.26022717  0.18958431  0.06085254 -0.19555087 -0.032012518 -0.014500094
6  -0.02086528 -0.38317048  0.07713133  0.09796064 -0.31268075  0.222255862  0.059880137
7  -0.10508543  0.01409683 -0.14651419  0.05481870 -0.35642590  0.022960793 -0.089668210
8  -0.08840425  0.11196218 -0.14691357  0.13599169 -0.50426472  0.276170256 -0.085434843
9   0.09277991 -0.13973942 -0.26492603  0.05665647 -0.23859828  0.249661073 -0.055284070
10 -0.06952550  0.13085555 -0.03925273  0.47919262  0.02120778 -0.005914517  0.020280392
11  0.17193083  0.02754811 -0.16745450  0.01038164 -0.33134883 -0.161581020 -0.098744432
         Q14_11       Q14_12       Q14_13      Q14_15      Q14_14       Q15_1       Q15_2
2  -0.229503180  0.262958528 -0.088168418 -0.18357401  0.36375534  0.05810586 -0.09733213
3  -0.001239108 -0.075826309 -0.112957114 -0.37397575 -1.31930510  0.14091441 -0.03081196
4  -0.315487224 -0.007346129  0.222386225 -0.28383966 -1.21942287  0.05122575 -0.06325836
5   0.066230837 -0.059986489  0.005158116 -0.42832907 -0.42928068  0.13615237  0.22059837
6  -0.095986255 -0.180277655  0.170708408 -0.17453253  0.08275291  0.13943228  0.04579892
7   0.076512557  0.052639798 -0.006889711 -0.34412733  0.13282396 -0.11720144  0.14338829
8  -0.469625879 -0.041115423 -0.233210269 -0.16128050 -0.25252432 -0.21576047  0.27073734
9  -0.195739508 -0.006969107  0.002077257 -0.30650357  0.01097325 -0.06273817  0.19679786
10  0.116274467  0.349799506 -0.024606874 -0.38092847  0.29626501  0.21029537  0.18387818
11 -0.177963413 -0.284788502 -0.045453081 -0.09792457 -0.50663398  0.20842377  0.03821965
         Q15_3      Q15_4     Q15_5       Q15_6       Q15_7       Q15_8       Q15_9      Q15_10
2  -0.40488343 0.34428650 0.4891544 -0.14251733  0.38386558 -0.18224086 -0.11912023 -0.09996463
3  -0.13608256 0.08706679 0.1061022  0.17730599  0.05108660 -0.10473172 -0.09425231  0.09431644
4   0.14950542 0.33989602 0.1830148  0.10328183  0.03640673  0.10349762 -0.08827289  0.26166627
5  -0.42961260 0.18572163 0.2393143 -0.08936696 -0.11378233  0.01055479 -0.03109619 -0.02824228
6  -0.08582446 0.08831954 0.3321812 -0.04410963  0.06720909 -0.08996181 -0.21562052  0.07080580
7  -0.20082430 0.18746675 0.3303431  0.10924398 -0.02852805 -0.14390277  0.06653401  0.18871334
8  -0.12530735 0.70345397 0.3166134  0.13840664  0.02992726 -0.26204245  0.23936382  0.07050664
9  -0.40551026 0.27086580 0.1275485  0.05598596 -0.02439782 -0.14804981 -0.09801881  0.11010110
10 -0.57682101 0.09470300 0.1651234  0.39384591  0.23589631 -0.71144656 -0.25760026 -0.32517041
11 -0.07959043 0.32230413 0.1483324 -0.13773477  0.04503476  0.12662749  0.32575176  0.03236908
        Q15_11      Q15_12        Q15_13     Q15_14      Q15_15      Q15_16      Q15_17
2   0.16032766  0.03665671 -1.403467e-02 -0.3886217  0.01779135 -0.21293620  0.22096561
3   0.26226532  0.16004692  4.121008e-02 -0.4067031  0.01711580  0.06409822  0.04549150
4   0.38574035 -0.28937310 -2.393017e-02 -0.2601586 -0.21436901 -0.22503506  0.23383482
5   0.18580903  0.03083824  9.703141e-02 -0.4467016  0.10191144 -0.16475444  0.09935191
6   0.05875572 -0.05034018 -8.837030e-02 -0.3885621 -0.18442755 -0.12654367  0.34786799
7   0.22865406 -0.03515164  4.344807e-02 -0.2866016 -0.13753391 -0.07210316  0.10080014
8   0.27140979  0.10749261 -1.175003e-01 -0.2946104 -0.11991293 -0.28494410 -0.11678627
9   0.29777150 -0.10590795  3.983593e-05 -0.2911798  0.06847877  0.11152112  0.17092460
10 -0.75558885 -0.03411834  5.158809e-01 -0.5950110  0.23862376 -0.12471037  0.68524004
11  0.42323762 -0.24392313 -9.101441e-02 -0.4035014  0.12010785 -0.08984163  0.10878433
        Q15_18      Q15_19       Q15_20      Q15_21       Q15_22     Q15_23
2  -0.31330692  0.01240573 -0.003992033  0.45381678  0.013077043 -1.9702690
3  -0.27774286 -0.11811972 -0.010654094  0.07298789  0.019539959 -0.1057625
4  -0.11021496 -0.22199759 -0.143727902 -0.02325880  0.094172456 -0.5613058
5  -0.26980062 -0.05021865 -0.076960114 -0.18655709 -0.062958614  0.1491968
6   0.13678916 -0.08966400 -0.035833686  0.14855685  0.030043329 -5.5666995
7  -0.10368830  0.04608581  0.022320927  0.06391885 -0.009857221  0.2192474
8   0.09517296 -0.15855948  0.022567302 -0.33017371  0.164728979 -0.4915665
9   0.02824367 -0.18306298  0.022958288  0.02514391  0.263908911 -1.8954204
10  0.04876036 -0.21687427 -0.042411349  0.62679404 -0.081083855 -0.7456743
11 -0.21195829 -0.29953099 -0.215043711  0.00739897  0.118867569  1.0260196
 [ reached getOption("max.print") -- omitted 1 row ]

Residual Deviance: 30507.05 
AIC: 32685.05 

Avaliando o modelo


ytest <- test %>% 
  select(Potential)


MLmetrics::Accuracy(ypred, ytest$Potential)
[1] 0.2975238

Se fossemos chutar uma classe dentre as 12 possíveis, teríamos 1/12 em média de acertos. Isso é menor que a acurácia obtida, então no geral nosso modelo conseguiu aprender um pouco sobre os diferentes perfis.

pROC::roc(response = ytest$Potential, predictor=as.numeric(ypred)) %>% 
  plot
Warning in roc.default(response = ytest$Potential, predictor = as.numeric(ypred)) :
  'response' has more than two levels. Consider setting 'levels' explicitly or using 'multiclass.roc' instead
Setting levels: control = 1, case = 2
Setting direction: controls < cases

Clustering


df_km <- df_logit %>% 
  select(-Potential)
adjust_kmeans <- function(k) {
  k_fit <- df_knn %>% 
    kmeans(k, iter.max = 30)
  
  w <- k_fit$tot.withinss
  tibble(k = k, w = w)
}

k_adjust <- map_dfr(2:10, adjust_kmeans)
k_adjust %>% 
  ggplot(
    aes(
      x = k, 
      y = w
    )
  ) + 
  geom_line() +
  geom_point(colour = "red", size = 3) +
  theme_minimal(12)

Iremos separar em 5 grupos…


k_adj <- df_km %>% 
  kmeans(5, iter.max = 30)

length(k_adj$cluster)
[1] 10499
df_km$cluster = k_adj$cluster

Analisando grupos

Frequencia de uso

df_km %>% 
  select(Q5, cluster) %>% 
  drop_na() %>% 
  mutate(
    Q5 = q5_answers[Q5,],
    cluster = as.factor(cluster)
  ) %>% 
  group_by(Q5, cluster) %>% 
    count() %>% 
  arrange(desc(n)) %>% 
  ggplot(
    aes(
      x = reorder(Q5, -n),
      y = n,
      fill = cluster
    )
  ) +
  geom_bar(
    stat = "identity",
    position = "fill"
  ) +
  labs(
    y = 'Frequência de acesso à loja de aplicativos',
    x = 'Total'
  ) +
  theme(
    axis.text.x = element_text(angle = 20, vjust = 0.5),
  )

Conseguimos ver que 2 grupos parecem acessar mais a loja do que os demais…

Visualizaremos a correlação:

cor(df_km$Q5, df_km$cluster)
[1] -0.2072271

Quanto maior o uso, menor o cluster… é o que conseguimos ver também em nosso gráfico.

Prosseguiremos…

  df %>% 
    select(starts_with(col), cluster) %>% 
    pivot_longer(cols = starts_with(col), names_to = names_to, values_to = values_to)
Error in `select()`:
! `match` must be a character vector of non empty strings.
Backtrace:
  1. df %>% select(starts_with(col), cluster) %>% ...
 24. tidyselect::starts_with(col)
 25. tidyselect:::check_match(match)

O que motiva as pessoas de cada um dos grupos a procurar por aplicativo?

Os grupos parecem ter uma distribuição homogenea no que diz respeito as razões por baixas aplicativo.

O que as pessoas dos grupos consideram para baixar um aplicativo?

---
title: "Worldwide Mobile App User Behavior Dataset"
author: "Diego"
date: "2/22/2022"
output: html_notebook
---

```{r setup, include=FALSE, echo = FALSE, echo = FALSE}
knitr::opts_chunk$set(cache = TRUE, collapse = TRUE)
library(readr)
library(tidyverse)
library(tidytext)
library(stringr)
```

## Contexto

...

## Análise

### Leitura do conjunto de dados

```{r}
df <- readxl::read_excel('./mobile_app_user_dataset_1.xlsx')[-1,]
```

### Exploração

> Uma vez que é uma pesquisa sobre *mobile devices*, veremos qual a proporção de pessoas que de fato possuem um *device*.

```{r}

df %>% 
  select(Q2) %>% 
  drop_na() %>% 
  mutate(
    Q2 = case_when(
      Q2 == 1 ~ "Possui",
      Q2 != 1 ~ "Não Possui"
    )
  ) %>% 
  ggplot(
    aes(
      y = Q2,
      fill = Q2
    )
  ) +
  geom_bar(
    position = "dodge",
  ) +
  geom_label(
      stat = 'count',
      aes(
        label = ..count..,
      ),
      color = 'white',
      show.legend = FALSE
  ) + 
  labs(
    y = "",
    x = "Total de Pessoas",
    title = "Distribuição de pessoas que tem ou não celular",
    subtitle = "Dados oriundos da pesquisa realizada pela Harvard"
  ) +
  scale_fill_manual(
    values = c( "#C4161C", "#009491"),
  ) +
  theme_classic() +
  theme(
    axis.title.x = element_text(vjust=-.2, size=11),
    legend.title = element_blank()
  ) 

```
<br />
<br />

> Podemos visualizar que a grande parte das pessoas possuem celular.

<br />

> A proporção de pessoas que não tem é de `r scales::percent(round(1208/10200, 2))`.

<br />

> Visualizaremos agora os diferentes tipos de dispositivos utilizados pelos usuários que possuem celular 
> 


```{r}

phone_format <- function (phone_list, phone_type, apply_function = function(param) param) {
  phone_dic = list(
    apple = c("apple", "iphone", "ipad", "aple", "appale", "ipod", "aplle", "i-phone", "ipone", "applke", "applr", "appme", "iphon"),
    blackberry = c("blackberry", "blackb", "blackeb", "baclkberry", "blakckberry", "blacberry", "blakberry", "blackerry", "bleckberry"),
    samsung = c("samsung", "samsumg", "sansung", "sumsung", "samsug", "samsun",  "samgung", "samsing", "samung", "sansug", "samasung", "samsang", "samsong", "sumsang", "galaxynote"),
    null = c("\\?", "9000", "930p"),
    sony_ericsson = c("sony-", "sonyer", "sony", "erison"),
    nokia = c("nokia", "nokya"),
    asus = c("asus"),
    acer = c("acer")
  ) 
  
  
  str_detect(phone_list, paste(phone_dic[[phone_type]], collapse = "|")) ~ apply_function(phone_type)
}

phones <- df %>%
  filter(Q2 == 1) %>% 
  select(Q3_1_TEXT) %>% 
  drop_na() %>% 
  mutate(
    Q3 = str_replace(str_to_lower(Q3_1_TEXT), " ", "")
  ) %>% 
  mutate(
    Q3 = case_when(
      phone_format(Q3, "apple"),
      phone_format(Q3, "samsung"),
      phone_format(Q3, "blackberry"),
      phone_format(Q3, "null"),
      phone_format(Q3, "sony_ericsson", function(param) str_replace(param, "_", " ")),
      TRUE ~ Q3
    )
  ) %>% 
  group_by(Q3) %>% 
  count() %>%
  arrange(desc(n)) 

phones
```

```{r}
length(names(df))
```

```{r}
df
```



```{r}

q5_answers <- data.frame(
  row.names = c(1, 2, 3, 4, 5, 6, 7, 8, 9),
  val = c("Never", "Less than once a month ", "Once a month", "More than once a month", "Once a week", "More than once a week", "Once a day", "Several times a day", "Other")
)

df %>% 
  select(Q5) %>% 
  drop_na() %>% 
  mutate(
    Q5_TEXT = qr_answers[Q5, ]
  ) %>% 
  group_by(Q5_TEXT) %>% 
  count() %>% 
  arrange(desc(n)) %>% 
  ggplot(
    aes(
      x = reorder(Q5_TEXT, -n),
      y = n,
      fill = Q5_TEXT
    )
  ) +
  geom_col() +
  labs(
    x = 'Frequencia de abertura da loja de aplicativos',
    y = 'Total',
    fill = "Frequência"
  ) +
  theme(
    axis.text.x = element_text(angle = 45, vjust=.6),
  )
  
```


```{r}

q6_answers <- data.frame(
  row.names = c(1, 2, 3, 4, 5, 6),
  val = c("0 - 1", "2 - 5", "6 - 10", "11 - 20", "21 - 30", "Mais de 30")
)


df %>% 
  select(Q6) %>% 
  drop_na() %>% 
  mutate(
    Q6_TEXT = q6_answers[Q6,]
  ) %>% 
  group_by(Q6_TEXT) %>% 
  count() %>% 
  ggplot(
    aes(
      x = reorder(Q6_TEXT, -n),
      y = n,
      fill = Q6_TEXT
    )
  ) +
  geom_col() +
  labs(
    x = 'Quantidade de aplicativos baixados por mês',
    y = 'Total',
  ) +
  theme_classic() +
  labs(
    fill = 'Frequência'
  ) +
  theme(
    axis.text.x = element_text(vjust = -1),
    axis.title.x = element_text(vjust = -1),
  )

```

Vamos ver se a galera que mais baixa é a galera que mais acessa a loja

```{r, fig.height = 10}

df %>% 
  select(Q5, Q6) %>% 
  drop_na() %>% 
  mutate(
    Q5 = q5_answers[Q5,],
    Q6 = q6_answers[Q6, ]
  ) %>% 
  group_by(Q5, Q6) %>% 
    count() %>% 
  arrange(desc(n)) %>% 
  ggplot(
    aes(
      y = reorder(Q5, -n),
      x = n,
      fill = Q6
    )
  ) +
  geom_bar(
    stat = "identity",
    position = position_dodge(width = 1)
  ) +
  geom_label(
    aes(
      label = n,
    ),
    size = 3
  ) +
  labs(
    y = 'Frequência de acesso à loja de aplicativos',
    x = 'Total'
  ) +
  theme(
    axis.text.x = element_text(angle = 20, vjust = 0.5),
  ) +
  facet_grid(rows = 'Q6')

```

#### Definindo função genéricas para contagem e plotagem de dummy vars

```{r}
arrange_and_plot <- function(df, 
                             cols, 
                             named_cols,
                             desc_col = "reason", 
                             legend.position = "none",
                             title = "",
                             xlabel = "",
                             ylabel = "",
                             show.legend = FALSE,
                             col.width = 0.5,
                             dodge.width = 0.5,
                             xaxis.title.size = 13,
                             xaxis.title.vjust = 0.5,
                             yaxis.title.size = 13,
                             yaxis.title.vjust = 0,
                             xaxis.text.angle = 0,
                             xaxis.text.vjust = 0,
                             invert.axis = FALSE,
                             hide.yaxis.title = FALSE,
                             hide.xaxis.title = FALSE
                             ) {
  rdf <- df %>% 
    select(cols) %>% 
    rowwise() %>% 
    sapply(as.numeric) %>% 
    as.tibble() %>% 
    rowwise() %>% 
    replace(is.na(.), 0) %>% 
    rowwise() %>% 
    sapply(sum, simplify = FALSE)  %>% 
    as.tibble()

  names(rdf) <- named_cols 
  
  plot <- rdf %>%
    gather(
      desc_col, "total", 1:ncol(.)
    ) %>% 
    ggplot(
      aes(
        x = if (invert.axis) total else reorder(desc_col, -total),
        y = if (invert.axis) reorder(desc_col, total) else total,
        fill = desc_col
      )
    ) +
    geom_col(
      width = col.width,
      position = position_dodge(dodge.width)
    )
  
  if (invert.axis) {
    plot <- plot +
      geom_label(
        aes(
          x = total,
          label = total,
        ),
        show.legend = show.legend
      )  
  } else {
    plot <- plot +
      geom_label(
        aes(
          y = total,
          label = total,
        ),
        show.legend = show.legend
      )
  }
  
  plot +
    labs(
        title = title,
        x = xlabel,
        y = ylabel
    ) +
    theme_classic() +
    theme(
      legend.position = legend.position,
      axis.title.x = if (!hide.xaxis.title) element_text(size=xaxis.title.size, vjust=xaxis.title.vjust)  else element_blank(),
      axis.title.y = if (!hide.yaxis.title) element_text(size=yaxis.title.size, vjust=yaxis.title.vjust) else element_blank(),
      axis.text.x = element_text(angle = xaxis.text.angle, vjust=xaxis.text.vjust)
    )
}


join_columns_and_plot <- function(dfp, cols) {
   dfp %>% 
    select(cols) %>% 
    rowwise() %>% 
    sapply(as.numeric) %>% 
    as.tibble() %>% 
    rowwise() %>% 
    replace(is.na(.), 0) %>% 
    rowwise() %>% 
    sapply(sum, simplify = FALSE)  %>% 
    as.tibble()
}

```


#### Principais motivos para baixar apps 

```{r, fig.width=9, fig.height=4}

q7_names <-c("Feeling Depressed", "Need to carry out a task", "Feeling bored", "Want to be entertained", "Need to know something", "Other")

q7_cols <- names(df)[(21:26)]

df %>% 
  arrange_and_plot(
    q7_cols,
    q7_names,
    title = 'Fatores motivadores que levam as pessoas a baixarem apps',
    xlabel = 'Motivo',
    ylabel = 'Total',
    dodge.width = 0.5,
    col.width = 0.6,
    xaxis.title.vjust = -0.5
    )
```


#### Principais formas de encontrar aplicativos


```{r, fig.width=6, height = 6}
q8_cols = names(df)[(27:35)]

q8_names <- c(
  "Compare several to choose one",
  "Download the first presented",
  "Featured apps",
  "Among top downloads",
  "Randomly choose one that might interest",
  "Search using keywords",
  "Visit websites that review apps",
  "Use search engines",
  "Other"
)

df %>% 
   arrange_and_plot(
    q8_cols,
    q8_names,
    title = 'Fatores motivadores que levam as pessoas a baixarem apps',
    xlabel = 'Total',
    ylabel = 'Motivo',
    dodge.width = 0.5,
    col.width = 0.6,
    invert.axis = TRUE
    )
  
```

#### O que mais consideram para baixar

```{r, fig.height=7, fig.width=10}

q9_cols <- names(df)[(36:48)]

q9_names <- c(
  "Reviews by other users",
  "Name of app (e.g., catchy name)",
  "Number of users who have downloaded the app",
  "Icon (e.g., if the icon is attractive)",
  "Description of the app",
  "Features",
  "Number of users who have rated the app",
  "Price",
  "Star rating",
  "Size of app",
  "Screen shots (e.g., see how it looks running)",
  "Who developed the app",
  "Other"
)


df %>% 
  arrange_and_plot(
    q9_cols,
    q9_names,
    "Motivo",
    title = "Motivos para escolher o aplicativo para baixar",
    xlabel = "Total",
    ylabel = "Porque baixa",
    col.width = 0.7,
    invert.axis = TRUE,
    hide.yaxis.title = TRUE,
    hide.xaxis.title = TRUE
  )
```

#### Porque de fato baixam um aplicativo

```{r}

q10_cols <- names(df)[(49:(49+14))]

q10_names <- c(
  "To interact with friends and/or family.",
  "To interact with people I don't know.",
  "To help me carry out a task.",
  "It is featured in the app store.",	
  "It is on the top downloads chart.",
  "It is advertised in the apps that I am using. ",
  "For entertainment.",
  "Out of curiosity. ",
  "An impulsive purchase.", 
  "It features brands or celebrities that\nI like\n(e.g., Coca-Cola, Michael Jackson). ",
  "It was mentioned in the media\n(e.g., TV, newspaper, radio, blogs). ",
  "It is an extension of the \nwebsite that I use (e.g., Facebook app). ",
  "It is recommended by friends and/or family. ",
  "For someone else (e.g., children, partner).",
  "Other"
)

df %>% 
  arrange_and_plot(
    q10_cols,
    q10_names,
    "Motivo",
    title = "Motivos que levam ao download do app",
    xlabel = "Total",
    ylabel = "",
    col.width = 0.6,
    dodge.width = 1,
    invert.axis = TRUE,
    hide.yaxis.title = TRUE,
    hide.xaxis.title = TRUE
  )
```


```{r}
q9_cols <- names(df)[(64:(63+12))]

df %>% 
  arrange_and_plot(
    q9_cols,
    q9_cols,
    invert.axis = TRUE
  )

```


```{r}

countries = c(
  "American",
  "Australian",
  "Brazilian",
  "British",
  "Canadian",
  "Chinese",
  "French",
  "German",
  "Indian",
  "Italian",
  "Japanese",
  "Mexican",
  "Russian",
  "South Korean",
  "Spanish",
  "Other",
  "Not assigned - NA"
)

country_df <- df %>% 
  group_by(Q19) %>% 
  count() %>% 
  dplyr::mutate(
    Q19 = as.numeric(Q19)
  ) %>%
  dplyr::arrange(Q19) %>% 
  mutate(
    Q19 = as.character(Q19)
  )


country_df$Q19 <- countries


country_df %>% 
  ggplot(
    aes(
      y = reorder(Q19, n),
      x = n,
      fill = Q19
    )
  ) +
  geom_bar(
    stat = "identity",
    position = position_dodge(10)
  ) +
  labs(
    x = 'Total de pessoas',
    y = 'País',
    fill = ''
  ) +
  theme(
    legend.position = "none",
    axis.text.x = element_text(vjust=0.5, angle = 15)
  )

```
```{r}
df %>% 
  select(names(df)[c(76:79)]) %>% 
  drop_na
```


```{r}
logit_user_feats <- c("Q5", "Q6", "Q16", "Q17", "Q18", "Q19", "Q23", "Q24", "Q26", "Q27")

df_logit <- df %>% 
  pivot_longer(starts_with("Q11_"), names_to="Potential", values_to="Potential_value") %>% 
  mutate(
    Potential = as.factor(as.numeric(str_extract(Potential, "([0-9]+)$"))),
    Q17 = as.integer(Q17)
  ) %>% 
  drop_na("Potential_value") %>% 
  select(
    logit_user_feats, starts_with("Q7_"), starts_with("Q8_"), 
    starts_with("Q9_"), starts_with("Q10_"), starts_with("Q11_"), 
    starts_with("Q13_"), starts_with("Q14_"), starts_with("Q15_"),
    Potential
  ) %>% 
  mutate_all(
    funs(as.numeric(.))
  ) %>% 
  mutate_all(
    funs(replace_na(., 0))
  ) %>% 
  mutate(
    Potential = as.factor(Potential)
  )

```


```{r}
df %>% 
  drop_na(Q17) %>% 
  group_by(Q17) %>% 
  count() %>% 
  arrange(desc(n))
```

```{r}
df_logit %>% 
  select(Potential) %>% 
  group_by(Potential) %>% 
  count() %>% 
  arrange(n)
  
```
### Logit

#### Treinando o modelo

```{r}

set.seed(123)

splits <- rsample::initial_split(df_logit)
train <- rsample::training(splits)
test <- rsample::testing(splits)
 
logit_fit <- nnet::multinom(Potential ~ ., family = "binomial", data = train, MaxNWts=10000)

```


#### Avaliando o modelo

```{r}

ytest <- test %>% 
  select(Potential)

ypred <- predict(logit_fit, test %>% 
                   select(-Potential))

MLmetrics::Accuracy(ypred, ytest$Potential)
```

Se fossemos chutar uma classe dentre as 12 possíveis, teríamos `1/12` em média de acertos. Isso é menor que a acurácia obtida, então no geral nosso modelo conseguiu aprender um pouco sobre os diferentes perfis.


```{r}
pROC::roc(response = ytest$Potential, predictor=as.numeric(ypred)) %>% 
  plot
```

### Clustering

```{r}

df_km <- df_logit %>% 
  select(-Potential)

```


```{r}
adjust_kmeans <- function(k) {
  k_fit <- df_km %>% 
    kmeans(k, iter.max = 30)
  
  w <- k_fit$tot.withinss
  tibble(k = k, w = w)
}

k_adjust <- map_dfr(2:10, adjust_kmeans)
```

```{r}
k_adjust %>% 
  ggplot(
    aes(
      x = k, 
      y = w
    )
  ) + 
  geom_line() +
  geom_point(colour = "red", size = 3) +
  theme_minimal(12)
```

Iremos separar em 5 grupos...

```{r}

k_adj <- df_km %>% 
  kmeans(5, iter.max = 30)

```

```{r}
df_km$cluster = k_adj$cluster
```

```{r}
df_km <- df_km %>% 
  mutate(
    cluster = as.factor(cluster)
  )
```

#### Analisando grupos

##### Frequencia de uso

```{r}

df_km %>% 
  select(Q5, cluster) %>% 
  drop_na() %>% 
  mutate(
    Q5 = q5_answers[Q5,]
  ) %>% 
  group_by(Q5, cluster) %>% 
    count() %>% 
  arrange(desc(n)) %>% 
  ggplot(
    aes(
      x = reorder(Q5, -n),
      y = n,
      fill = cluster
    )
  ) +
  geom_bar(
    stat = "identity",
    position = "fill"
  ) +
  labs(
    y = 'Frequência de acesso à loja de aplicativos',
    x = 'Total'
  ) +
  theme(
    axis.text.x = element_text(angle = 20, vjust = 0.5),
  )
```

Conseguimos ver que 2 grupos parecem acessar mais a loja do que os demais... 

Visualizaremos a correlação:

```{r}
cor(df_km$Q5, df_km$cluster)
```

Quanto maior o uso, menor o cluster... é o que conseguimos ver também em nosso gráfico.

Prosseguiremos...

```{r}
make_count_from_question <- function (df, col, names_to = "column", values_to = "column_value") {
  df %>% 
    select(starts_with(col), cluster) %>% 
    pivot_longer(cols = starts_with(col), names_to = names_to, values_to = values_to)
}

regex_only_numbers = '([0-9])$'
```


#### O que motiva as pessoas de cada um dos grupos a procurar por aplicativo?

```{r}
df_km %>% 
  select(starts_with("Q7_"), cluster) %>% 
  pivot_longer(cols = starts_with("Q7_"), names_to = "motivo", values_to = "valor_motivo") %>% 
  mutate(
    motivo_n = str_extract(motivo, '([0-9])$')
  ) %>% 
  filter(valor_motivo == 1) %>%
  group_by(cluster, motivo) %>% 
  count() %>% 
  ungroup() %>% 
  ggplot(
    aes(
      x = motivo,
      y = n,
      fill = cluster,
      label = n
    )
  ) +
  geom_bar(
    stat = "identity",
    position = "fill"
  ) +
  scale_x_discrete(
    labels = q7_names
  )  +
  labs(
    x = 'Motivo',
    y = 'Porcentagem'
  ) +
  theme(
    axis.text.x = element_text(angle = 20, vjust = 0.5),
  ) 

```
Os grupos parecem ter uma distribuição homogenea no que diz respeito as razões por baixas aplicativo. 

#### O que as pessoas dos grupos consideram para baixar um aplicativo?

```{r}

select(df_km, starts_with("Q7_"), cluster) %>% 
  make_count_from_question("Q7_", "motivo", "valor_motivo") %>% 
  mutate(
    motivo = str_extract(motivo, regex_only_numbers)
  ) %>% 
  filter(valor_motivo == 1) %>% 
  group_by(cluster, motivo) %>% 
  count() %>%
  ggplot(
    aes(
      x = motivo,
      y = n,
      fill = cluster
    )
  ) +
  geom_bar(
    stat = "identity",
    position = "fill"
  ) +
  scale_x_discrete(
    labels = q9_names
  ) +
  theme(
    axis.text.x = element_text(angle = 10, vjust = .6)
  )
```

